S-92245A589 5/16"-18 x 1 3/4" FF-S-85, MS35307-339 Mil. Spec. 18-8 Stainless Steel Hex Head Screws
Mil. Spec. 18-8 Stainless Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and stress
- Precise Class 2A thread fit guarantees smooth assembly and secure fastening in UNC coarse thread applications
- External hex drive design provides excellent torque transmission and easy installation with standard tools
- Durable Rockwell B74 hardness maintains thread integrity and prevents stripping during repeated use
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance
- Partially threaded shank allows for controlled clamping force and reduced risk of cross-threading
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw delivers exceptional engineering value in demanding applications where corrosion resistance and mechanical strength are critical. The passivated 18-8 stainless steel material provides excellent protection against rust and chemical exposure, making it ideal for marine, chemical processing, and outdoor equipment. The coarse UNC thread and Class 2A fit ensure quick assembly and vibration resistance in structural frameworks, machinery, and transportation equipment. With its external hex drive and 70,000 psi tensile strength, it solves common industrial pain points like fastener failure under dynamic loads and difficult maintenance access, providing long-term reliability in heavy-duty fastening systems.
Specification Summary & Compliance
This screw features precise Class 2A thread fit with UNC coarse threading (5/16"-18) and a minimum thread length of 7/8". It conforms to Fed. Spec. FF-S-85 (MS35307-339) manufacturing standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both dimensional accuracy and regulatory adherence for industrial procurement.
